C) It drives the convection currents in the mantle.
- The radioactive decay of elements in the Earth's mantle and crust results in production of daughter isotopes and release of neutrinos and heat energy.
- The radioactive decay in Earth's crust and mantle continuously adds heat and slows the cooling of the Earth.
- The heat from radioactive decay is thought to be distributed in the crust and mantle layers of the planet, greatly influencing currents in the mantle.
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